Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. If you continue browsing the site, you agree to the use of cookies on this website. See our User Agreement and Privacy Policy.

Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. If you continue browsing the site, you agree to the use of cookies on this website. See our Privacy Policy and User Agreement for details.

24.
B 1 Same line as direction of motion OR At an agle to the direction of motion Fg┴ Fy Fx Fg║DocScientia p. 21

25.
contact forces B objects are in contact with each other Normal forces (FN) 3Force exerted by a surface on an objecton that surfaceAlways perpendicular to the surfaceSupporting force is equal and opposite tothe force of the objectDocScientia p. 21

26.
contact forces B objects are in contact with each other Tension (FT) 4 Pulled cable/rope = tension Tension is constant Two directions Mass = negligible, if asked to add: Gravitational force will act on the center of the ropeDocScientia p. 22

27.
contact forces B objects are in contact with each other Air friction (Fair) 5 Offer resistance to objects moving through air Acts in the opposite direction to movementDocScientia p. 22

28.
contact forces B objects are in contact with each other Compression (Fspring) 6 Equal in magnitude, exerted on any object touching the springDocScientia p. 22

71.
1 An object will stay at rest or continue to move at a constant speed in a straight line (at a constant velocity), unless acted upon by an external net force. Professor Mac Spock explainsDocScientia p 59 Newtons first law of motion/Law of inertia

72.
The resistance of an object to a change in its state of motion or rest. Because of inertia objects tend to remain at rest or continue at uniform velocity.DocScientia p 60 Inertia

73.
Not a force – characteristic of matter Anything with mass has inertia Mass is a measure of inertia Greater mass = greater inertiaDocScientia p 60

74.
In a frictionless system: Ball reaches same height as where the motion starts, even when the slope is reduced. Loss in height is due to friction. The ball would continue to roll as long as thereDocScientia p 60 is no friction.

75.
Net force is not necessary for continuous constant motion in a straight line – it is needed to stop an object.DocScientia p 60

76.
Protect against sudden changes in motion. According to Newtons first law, a person will continue to move until Seatbelt safety something stops them.DocScientia p 60

77.
2 If a net force acts on an object, the object will accelerate in the direction of the net force. Acceleration is directly proportional to net force and inversely proportional to mass. Prof Mac Second Law Fnet = maDocScientia p 66 Newtons second law of motion

78.
3 If object A exerts a force on object B, object B exerts an equal but opposite force on object B.1 2 3DocScientia p 88 Newtons second law of motion

80.
A force of gravitational attraction exists between any two objects in the universe that have mass. This force of attraction is directly proportional to the product of the masses of the objects and inversely proportional to the squared distance between their centres of gravity.DocScientia p 95 Law of universal gravitation

86.
Gg If one object is a planet m and the other is an object the gravitational attraction force is the r weight. The objects mass is m, M the planets mass is M and the distance (radius of the planet) is r.F = G mM mg = G mM g = G M 2 2 2 r r RDocScientia p 98